Telephone-receiver.



Patented Apr. 2, 1912.

lll/lll cnLuMBlA PMNoaRAPl-l co., wAsmNu'roN. n, c.

' UNITED sTATEs PATENT oEEIoE.

WILLIAM w. DEAN, or ELYEIA, oHIo, AssIeNoE To THE DEAN ELECTRIC COMPANY,0E ELYEIA, oHIo, A CORPORATION 0E oHIo.

` TELEPHONE-RECEIVER.

Specification. of Letters Patent.

Patented Apr. 2, 1912.

Application liled October 8,1 98. Serial No. 456,760.

To all whom 'it may concern:

Be itknown that I, WILLIAM W. DEAN, a

:citizen of the United States, residing at a receiver shell of metal,which shall accomplish all of the purposes heretofore secured inconnection with shells for such instruments and having the additionaladvantage of lightness, durability, improved appearance and cheapness.

Receiver shells have commonly been made heretofore of insulatingImaterial of one form or another which, generally speaking, is verybritt-le in nature and therefore easily broken. have usually beenconstructed of considerable thickness, with the result that they areboth clumsy andI heavy. By my invention I construct these shells of thinsheet metal and secure thereto a threaded ringV of heavier metal,adapted to coperate with the threaded portion of the receiver cap. Thisreceiver cap may be constructed in one piece, or it may be constructedin a manner similar to the body portion of the shell. That is, it mayconsist in a main portion formed of thin sheet metal, secured to whichis av -threaded ring of heavier metal. kIf preferred, a cap ofinsulatingmaterial may be used in connect-ion with the met-al shellinstead of the metallic cap just referredl to.

`In constructing my improvedv receiver shell I make use preferably offorming dies to form suitable sheet metal into the desired conformation.In order to be readily `manipulatedso as to assume the form required7the sheet metal used must be preferably relatively thin. This thinmaterial, however, is not adapted to be threaded, since the threadswould be so ne necessarily as to be 'of no use. Furthermore, thethreaded portion would not possess sufficient rigidity to readilyVengage the coperating `threaded To avoid this diiiiculty the shells gsome time. larly in the case in which bot-h the receiver member. Byinvent-ion I eliminate this difliculty by securing to the thin metalforming the body portion of the shell a separate ring, which ispreferably of metal, al-V though other material may be used if desired.This ring serves to permit the forming of threads Vof suitable size tobe'practical, and also serves to reinforce the threadj ed end of theshell,l so that it may be readily lngaged by the coperating threadedmemer.

A furtherk advantage secured by this construction is that the receivershell is comparatively light. In the event of forming theshell ofmaterial thick enough to be properly threaded, the shell would be so fheavy as to practically prohibit its use.

A further advantage secured by my improved construction is to be foundin the I casein which the main portion of both the g shell proper andthe cap. are formed, for the sake of cheapness, of thin sheet steel. Theconstruction used which is above described yand forms the subject matterof this invention permits the use of threaded rings of other material inconnection with the formed i steel members, as a result of which thepossibility of corrosion of the threads engaging each other may beeliminated. If a steel shell had formed directly thereon the threads forengaging the cap, serious difficulty would result from the corrosion ofthe steel threads andL in many cases would make it practicallyimpossible to remove the cap from the receiver after the same had beenin use for This result would occur particuand the cap were made ofsteel, each having the threads carried thereby formed directly in thesteel itself.

In connection with the use of sheet steel for forming the main portionof the shell proper and the cap I- employ a protecting varnish orcoating, as for example enamel or japan, to thoroughly protect the steelfrom the contact of moisture. This means could not be usedsatisfactorilyL to protect the steel screw threads above referredy to,since evidently the screw threads in order to properly perform theirfunction must be clean and free from any foreign matter. In addition tothe insulation thus secured by the enamel coating Within the shell, Iemploy separate insulating means between the shell and the cooperatingmechanism of the receiver contained therein. I find that vulcanizedfiber answers admirably for this purpose, although other insulatingmaterial may be used if desired.

The several drawings illustrating my invention are as follows:

Figure 1 is a longitudinal sectional view taken through the receivershell proper and the receiver cap and shows the coperating mechanismcontained within the shell. Fig. 2 shows a modified form of insulatingpartition that may be used in place of that shown in Fig. 1. Fig. 3shows in a longitudinal sectional view the details of the constructionof the coperating parts of the threaded portions of the receiver shellproper and the receiver cap. Fig. 4 shows partly in longitudinalsectional view and partly in side view the receiver cap. Fig. 5 shows ina view similar to Fig. 4 the port-ion of the receiver shell properadapted to engage the receiver cap. Fig. 6 shows in enlarged sectionalview similar to Fig. 3, the coperating threaded rings and the meansemployed to secure them to the receiver shell proper and the receivercap; and Figs. 7 and 8 are detail sectional views of a modifiedconstruction of the receiver cap and the body portion of the receivershell, respectively.

Similar numerals refer to similar parts throughout the several views.

As shown in the several drawings, the receiver -shell 1 is of tubularconformation, having a slight taper, as indicated, and is enlarged atits left-hand end to support the threaded ring used to engage thereceiver cap. At this enlarged end, as shown more clearly in Fig. 6, thematerial of the shell 1 is formed at 1a to a smaller diameter than thematerial of the adjacent portion of the shell. The portion 1fL isadapted to fit within the threaded ring 4, and after this ring 4 hasbeen placed upon the portion 11, the outer end of the shell 1 is turnedoutward, as shown at 1b, to securely hold the ring 4 in place. The shellis crimped at 1c forming an abutment for the ring and preventing itssliding upon the shell. The smaller end of the shell 1 has an enlargedannular portion 17 formed thereon, which is adapted to engage thereceiver hook when the receiver is not in use. rIhre material of theshell is continued around the smaller end and has an opening 15 formedin the end, through which the conductor cord 16 is adapted to pass. Theedges of the opening 15 are formed inward, as indicated, so that theharp edge of the opening cannot come in lontact with the conductor cord.

The cooperating mechanism of the receiver is of the well known type inwhich such mechanism is completely assembled independently of thereceiver casing. As shown in the drawings, it consists essentially ofpermanent magnets 9, 9 having secured to their left-hand ends a metalcup 10 within which the receiver coils 11, 11 are located. The outeredge of the cup 10 is threaded and adapted to coperate with a threadedring 14, the diaphragm 13 of the receiver being clamped between thethreaded ring 14 and the cup 10 in operative relation to the poles 12extending through the coils. The coperative mechanism just described isinsulated from the shell 1 by means of tubes 2 and 3 of insulatingmaterial, such as vulcanized liber or the like, which effectuallyprevent contact between the metal of the shell and any part of thecooperating mechanism. Vhile I find it desirable in practice to formthis insulating lining in two parts, it is, however, not essential thatthis be done and I may use a onepiece lining in place thereof.

The cap used to close the larger end of the shell 1 and to secure inposition therein the `coperating mechanism, consists of a main portion Gof thin sheet metal formed as indicated and adapted to contain withinits larger end a ring 5, which is secured in such posit-ion by turningthe larger end of the portion 6 down against the ring as indicated at 6ain Fig. 6. The ring 5 and cap 6 are so proportioned that the ring justfits within the larger cylindrical portion of the cap. An insulatingdisk 7 of fiber or similar material is used to prevent contact betweenthe coperating mechanism of the receiver and the receiver cap.` Thisdisk also serves as a barrier between the space occupied by thetelephone diaphragm and the hollow space in the conveX part of the earcap. As will be seen from the drawing, the center of the cap isdepressed forming a crater like receptacle for the ear and a hollowportion on the interior. The sound waves emanating from the diaphragmwould pass into this hollow space and be dissipated unless some meanswere employed to bar them out.

As shown in Figs. 7 and 8, the reinforcing rings formed on the receivercap and on the body portion of the receiver shell to receive the threadsformed therein to secure the cap to the shell may, if preferred, be madeby thickening the metal of the cap and shell, as indicated, by upsettingthe metal in suitable dies. This construction, while it may not bedesirable in all cases, is particularly applicable to the constructionof receiver shells of metals or alloys that do not readily corrode.

As shown in Fig. 2, the insulating lining of the receiver shell mayconsist in two 1. In a telephone receiver shell, the com-y adapted tofit within the end of one of said portions, the edge of the portionbeing bent over to retain the ring and threads on said other portion andadapted to engage the threaded ring to unite the parts.

3. In a telephone receiver, the combination of a metallic receivershell, a cap therefor, receiver mechanism mounted in said shell and aninsulating member between the cap and mechanism to insulate each fromthe other.

4. In a telephone receiver shell, the com bination of a main portion, acap, and a threaded ring mounted on said main portion and adapted toengage said cap to secure said parts together, said body portion beingfolded over to form an abutment for said ring.

5. A telephone receiver consisting of a body portion formed from thinsheet metal, and afseparate threaded ring secured thereto by forming apart of the body portion around it and adapted to engage the receivercap.y

6. A telephone receiver shell consisting of a body portion and a cap,such cap comprising a perforated member formed from thin sheet metal andadapted to communicate sound waves from the receiver to the ear, and aseparate threaded ring secured thereto by forming a part of theperforated member around it and adapted to engage. the body portion ofthe receiver shell.

7. A telephone receiver shell consisting of two elements one of which isthe body portion ofthe shell and the other a cap, one of such elementscomprising a main member formed from thin sheet steel and a threadedring of other material secured thereto by forming such element aroundit, such ring being adapted to engage the other element.

8. A telephone receiver shell consisting of two elements one of which isthe body portion of the shell and the other a cap, each Vofsuchele-ments comprising a main member formed from thin sheet steel and athreaded ring of otherv material secured thereto by forming such elementaround it, such rings adapted to engage each other.

9. A telephone receiver shell consisting of two parts, one of such partsformed from thin sheet metal, and a separate externally threaded ringsecured t-o such part by forming it wit-hin and around the ends of thering, such ring being adapted to engage the other part.

10. A telephone receiver shell consisting of two parts, one of suchparts formed fromr thin sheet metal, and a separate internally threadedring secured to such part by forming it outside of and around the endsof the ring, such ring being adapted to engage the other part.

11. A telephone receiver shell consisting of two parts, one of suchparts formed from ythin sheet metal and a separate externally threadedring secured to such part by forming it Within and around the ends ofthe ring, and the other part formed from thin sheet met-al and asepara-te internally threaded ring secured to such other part by formingit outside of and around the ends of the ring, such rings adapted toengage each other.

12. In a telephone receiver shell, the 'combination of a main portioncrimped near its edge to form an abutment and extended from the crimpedportion to the edge substantially parallel to the axis of the shell, athreaded member set in the extension, abutting against said crimped partand secured to said shell, and a cap adapted to engage said, threadedmember to Secure it to said main portion. y

13. A telephone receiver shell consisting of two elements one of whichis the body portion of the shell and the other a cap, one of suchelements comprising a main member and a threaded ring of other materialsecured thereto by forming such element around it, such ring beingadapted to engage' the other element, and such body port-ion conformedto prevent chaiing of the conductors extending therethrough to thecoperating mechanism of the receiver.

14. In a telephone receiver, the combination of a receiver shell, asheet metal cap therefor, having a concave inner portion and aninsulating diaphragm to close said concave portion.

15. In a telephone receiver, the combination of a receiver shell, asheet metal cap therefor, the metal of the cap being depressed atthecenter thereof to form a crater like receptacle for the ear and aninsulating disk clampedy between the cap and shell.

16. In a telephone receiver, the comb-ination of a receiver shell, asheet metal cap therefor, the metal of the cap being demy name this 5thday of October A. D., pressed at the center thereof to form a crater1908. like receptacle for the ear, said cap having a concave innerportion and an insulating VILLIAM W. DEAN.

member clamped between the cap and shell Witnesses: closing the concaveportion of the cap. A. D. T. LIBBY, In Witness whereof, I hereuntosubscribe W. B. MANSON.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

v Washington,' C.

